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| author | Rich Felker <dalias@aerifal.cx> | 2012-04-23 16:10:36 -0400 |
|---|---|---|
| committer | Rich Felker <dalias@aerifal.cx> | 2012-04-23 16:10:36 -0400 |
| commit | 38b5d7d0526be24fba0f0789407727e4e7950e63 (patch) | |
| tree | 3a37bf481d568fc073f03b6a2111db4474ffeae2 | |
| parent | 640fe75ce8e0ca3a1af98197a93e9aa4884f79bf (diff) | |
| download | musl-38b5d7d0526be24fba0f0789407727e4e7950e63.tar.gz musl-38b5d7d0526be24fba0f0789407727e4e7950e63.tar.bz2 musl-38b5d7d0526be24fba0f0789407727e4e7950e63.tar.xz musl-38b5d7d0526be24fba0f0789407727e4e7950e63.zip | |
optimize iswprint
| -rw-r--r-- | src/ctype/iswprint.c | 15 |
1 files changed, 12 insertions, 3 deletions
diff --git a/src/ctype/iswprint.c b/src/ctype/iswprint.c index 7717671a..333f19c2 100644 --- a/src/ctype/iswprint.c +++ b/src/ctype/iswprint.c @@ -1,10 +1,19 @@ #include <wctype.h> +/* Consider all legal codepoints as printable except for: + * - C0 and C1 control characters + * - U+2028 and U+2029 (line/para break) + * - U+FFF9 through U+FFFB (interlinear annotation controls) + * The following code is optimized heavily to make hot paths for the + * expected printable characters. */ + int iswprint(wint_t wc) { - unsigned c = wc; - /* assume any non-control, non-illegal codepoint is printable */ - if (c>0x10ffff || c-0xd800<0x800 || (c&0xfffe)==0xfffe || iswcntrl(c)) + if (wc < 0xffU) + return (wc+1 & 0x7f) >= 0x21; + if (wc < 0x2028U || wc-0x202aU < 0xd800-0x202a || wc-0xe000U < 0xfff9-0xe000) + return 1; + if (wc-0xfffcU > 0x10ffff-0xfffc || (wc&0xfffe)==0xfffe) return 0; return 1; } |